too bad those LED do a *miserable* job of lighting an area, and only illuminate a *fraction* of the same area at that as conventional bulb, and have weird spectrum.
As an actual user of LED lights, I have noticed NONE of these problems. The base of the light contains a reflector, so less light is absorbed by the fixture, but that just seems like good design. I might notice the "weird" spectrum if I used some specialized instrument, but to my eyes, the light looks normal.
Less light, less area, bad spectrum, that's the three problems of current LED bulb tech.
I think your ideas of "current" LED bulb tech, are not current. You might want to look at a modern bulb.
As for efficiency, seven months out of the year, the incandescent energy output is 100% useful to me.
You might want to look up Carnot Efficiency. More than half the energy in the fuel is dumped into the heat sink by your power company. About another 5% is lost in transmission. If you want heat, you should burn fuel in your furnace, not at a power company. Using electricity for heat is very wasteful.